r.serrano

TL2 · Osijek

Contributes reviews on supplier material. Based in Osijek.

Joined 13 February 2025 · last posted 12h

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A promotion I argued against, and why I lost — a second dataset Replied, post #8 · Documentation › Doc review · 27 Jul 2026 · 0 likes A promotion that is declined should leave the topic linked from wherever the question recurs, so the work is not lost.
Seven-day rolling means and why weekly readings mislead Replied, post #97 · Outcomes › Progress reports · 24 Jul 2026 · 0 likes This is the answer, and the reason it is the answer is the more useful part.
Distinguishing a red flag from an inconvenience — a second dataset Replied, post #4 · Sourcing › Red flags · 19 Jul 2026 · 28 likes The number people quote for Distinguishing a red flag is a central estimate presented without its interval, and the interval is wide enough that the estimate is nearly…
Reflectance and photometric devices: precision in practice — a second dataset Replied, post #76 · Analytics › Home & field testing · 19 Jul 2026 · 21 likes A home refractometer is not measuring what people hope it is measuring in these preparations, and the readings are dominated by everything other than the peptide. I…
eGFR fluctuation and the creatinine denominator problem — the long version Replied, post #8 · Clinical › Bloodwork · 17 Jul 2026 · 12 likes Glycaemic markers integrate over different periods. A point glucose and a longer-term marker disagreeing is not a contradiction; it is two different questions. Happy to…
What consumer-accessible tests can and cannot determine — a second dataset Replied, post #90 · Analytics › Home & field testing · 16 Jul 2026 · 2 likes The right question for any home test is: what physical quantity does it measure, and what would have to be true for that quantity to answer your question? Most…
Historical amylin analogues and what happened to them Replied, post #31 · Compounds › Cagrilintide & amylin analogues · 13 Jul 2026 · 11 likes The monoisotopic mass sits near 3749.9 Da, and the same caveat applies as everywhere else: a mass consistent with the proposed structure is a necessary condition and…
Mass error in ppm: the arithmetic and the caveat — a second dataset Replied, post #19 · Analytics › Mass spectrometry · 12 Jul 2026 · 21 likes Adducts — sodium and potassium especially — shift the observed mass in predictable increments. A report showing an unexplained plus twenty-two is usually showing you a…
Second pass at: Metformin co-administration and additive GI effects Replied, post #143 · Practice › Interactions · 9 Jul 2026 · 2 likes Metformin: commonly co-administered and relevant to gastrointestinal tolerability. Gastrointestinal side effects can overlap and additive. Taking them separately or…
How to ask a question when you cannot say why you are asking it Replied, post #27 · Start Here › How to Ask · 1 Jul 2026 · 0 likes Picking up post #24: that is the part I would want checked first. A photograph of a vial is rarely useful and a photograph of a document usually is. Redact the…
0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Replied, post #77 · Devices › Syringes & needles · 19 Jun 2026 · 0 likes Adding the measurement that post #74 says would settle it. An observation about 0.3 ml versus 0.5 ml that I cannot explain and am posting anyway, on the principle that…
Why a glucagon receptor agonist in a weight-loss compound is not a contradiction Replied, post #3 · Compounds › Retatrutide · 11 Jun 2026 · 0 likes Glycaemic effects improved rather than worsened in the diabetes work despite the glucagon component, which is the observation that resolves the apparent paradox. It is…